NXP backend: Add pass for adding batch dimension for 3D input avgpool…

[roman-janik-nxp]

…2d and maxpool2d

Summary

The pass is needed for Neutron converter to accept avgpool2d or maxpool2d ops, as it requires 4D input for them. Previously delegation of 3D inputs with these ops failed.

Test plan

Unit test provided.

cc @robert-kalmar @JakeStevens @digantdesai @rascani

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21572

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 399ef3b with merge base e0a91fe ():

NEW FAILURE - The following job has failed:

• Build Presets / apple (ios) / build (gh)
  ##[error]fatal: unable to access 'https://github.com/google/flatbuffers.git/': Could not resolve host: github.com

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest-editable / macos / macos-job (gh) (matched macos rule in flaky-rules.json)
  ##[error]File doesn't exist

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